Named after Nikolaj Ivanovich Tikhomirov - Soviet chemical engineer (1860-1930).
Tikhomorov is the heavily eroded remains of a lunar impact crater. It lies to the northeast of the smaller crater Konstantinov, and to the southwest of Trumpler. Farther to the west-northwest is Mare Moscoviense, one of the few maria on the far side. This crater has been so heavily eroded by subsequent impacts that there is little to distinguish it from the nearby terrain. (wikipedia entry)
A crater is a circular depression likely created by an impact event. On the Moon they are named after deceased scientists, polar explorers, astronauts or cosmonauts.